USDF as collateral.

The official RPC serves current state only. To read a past block, use an archive RPC; each of these serves historical state:

• https://robinhood.api.pocket.network
• https://rpc-robinhood.globalstake.io
• https://rpc-robinhood.blockmachine.io
• https://rpc.ordofi.network

Read the reserve, supply and ratio in one call

ReserveView 0x00B39A3741C914A5f4eD3EeFFEfc1e80bAFEa7B1, function snapshot(), selector 0x9711715a.

curl -s https://robinhood.api.pocket.network \
  -H 'content-type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_call","params":[{"to":"0x00B39A3741C914A5f4eD3EeFFEfc1e80bAFEa7B1","data":"0x9711715a"},"<block in hex>"]}'

ReserveView was deployed in block 77,596,218. For an earlier block, back to 75,710,526 when USDF was deployed, the same call carries ReserveView's own runtime code as a state override in the third parameter, so it reads that block's reserve and supply exactly as the contract does; each archive RPC above accepts it. At block 75,800,000:

curl -s https://robinhood.api.pocket.network \
  -H 'content-type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"eth_call","params":[{"to":"0x00B39A3741C914A5f4eD3EeFFEfc1e80bAFEa7B1","data":"0x9711715a"},"0x4849dc0",{"0x00B39A3741C914A5f4eD3EeFFEfc1e80bAFEa7B1":{"code":"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"}}]}'

Verify the signed attestation

Latest attestation JSON

1. Take the canonical string from the attestation JSON, exactly as served.
2. Compute keccak256(canonical); it equals the keccak256 field.
3. Recover the EIP-191 personal-sign signer of that hash from signature (ecrecover).
4. The recovered address equals the attestation's signer: 0xE19B4CaEB29409f2F6AFc10Edc98542c5d122B7a.